net/dsa/dsa.c

   1 /*
   2  * net/dsa/dsa.c - Hardware switch handling
   3  * Copyright (c) 2008-2009 Marvell Semiconductor
   4  * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/ctype.h>
  13 #include <linux/device.h>
  14 #include <linux/hwmon.h>
  15 #include <linux/list.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/slab.h>
  18 #include <linux/module.h>
  19 #include <net/dsa.h>
  20 #include <linux/of.h>
  21 #include <linux/of_mdio.h>
  22 #include <linux/of_platform.h>
  23 #include <linux/of_net.h>
  24 #include <linux/of_gpio.h>
  25 #include <linux/sysfs.h>
  26 #include <linux/phy_fixed.h>
  27 #include <linux/gpio/consumer.h>
  28 #include "dsa_priv.h"
  29
  30 char dsa_driver_version[] = "0.1";
  31
  32 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
  33                                             struct net_device *dev)
  34 {
  35         /* Just return the original SKB */
  36         return skb;
  37 }
  38
  39 static const struct dsa_device_ops none_ops = {
  40         .xmit   = dsa_slave_notag_xmit,
  41         .rcv    = NULL,
  42 };
  43
  44 const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
  45 #ifdef CONFIG_NET_DSA_TAG_DSA
  46         [DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
  47 #endif
  48 #ifdef CONFIG_NET_DSA_TAG_EDSA
  49         [DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
  50 #endif
  51 #ifdef CONFIG_NET_DSA_TAG_TRAILER
  52         [DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
  53 #endif
  54 #ifdef CONFIG_NET_DSA_TAG_BRCM
  55         [DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
  56 #endif
  57         [DSA_TAG_PROTO_NONE] = &none_ops,
  58 };
  59
  60 /* switch driver registration ***********************************************/
  61 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
  62 static LIST_HEAD(dsa_switch_drivers);
  63
  64 void register_switch_driver(struct dsa_switch_driver *drv)
  65 {
  66         mutex_lock(&dsa_switch_drivers_mutex);
  67         list_add_tail(&drv->list, &dsa_switch_drivers);
  68         mutex_unlock(&dsa_switch_drivers_mutex);
  69 }
  70 EXPORT_SYMBOL_GPL(register_switch_driver);
  71
  72 void unregister_switch_driver(struct dsa_switch_driver *drv)
  73 {
  74         mutex_lock(&dsa_switch_drivers_mutex);
  75         list_del_init(&drv->list);
  76         mutex_unlock(&dsa_switch_drivers_mutex);
  77 }
  78 EXPORT_SYMBOL_GPL(unregister_switch_driver);
  79
  80 static struct dsa_switch_driver *
  81 dsa_switch_probe(struct device *parent, struct device *host_dev, int sw_addr,
  82                  const char **_name, void **priv)
  83 {
  84         struct dsa_switch_driver *ret;
  85         struct list_head *list;
  86         const char *name;
  87
  88         ret = NULL;
  89         name = NULL;
  90
  91         mutex_lock(&dsa_switch_drivers_mutex);
  92         list_for_each(list, &dsa_switch_drivers) {
  93                 struct dsa_switch_driver *drv;
  94
  95                 drv = list_entry(list, struct dsa_switch_driver, list);
  96
  97                 name = drv->probe(parent, host_dev, sw_addr, priv);
  98                 if (name != NULL) {
  99                         ret = drv;
 100                         break;
 101                 }
 102         }
 103         mutex_unlock(&dsa_switch_drivers_mutex);
 104
 105         *_name = name;
 106
 107         return ret;
 108 }
 109
 110 /* hwmon support ************************************************************/
 111
 112 #ifdef CONFIG_NET_DSA_HWMON
 113
 114 static ssize_t temp1_input_show(struct device *dev,
 115                                 struct device_attribute *attr, char *buf)
 116 {
 117         struct dsa_switch *ds = dev_get_drvdata(dev);
 118         int temp, ret;
 119
 120         ret = ds->drv->get_temp(ds, &temp);
 121         if (ret < 0)
 122                 return ret;
 123
 124         return sprintf(buf, "%d\n", temp * 1000);
 125 }
 126 static DEVICE_ATTR_RO(temp1_input);
 127
 128 static ssize_t temp1_max_show(struct device *dev,
 129                               struct device_attribute *attr, char *buf)
 130 {
 131         struct dsa_switch *ds = dev_get_drvdata(dev);
 132         int temp, ret;
 133
 134         ret = ds->drv->get_temp_limit(ds, &temp);
 135         if (ret < 0)
 136                 return ret;
 137
 138         return sprintf(buf, "%d\n", temp * 1000);
 139 }
 140
 141 static ssize_t temp1_max_store(struct device *dev,
 142                                struct device_attribute *attr, const char *buf,
 143                                size_t count)
 144 {
 145         struct dsa_switch *ds = dev_get_drvdata(dev);
 146         int temp, ret;
 147
 148         ret = kstrtoint(buf, 0, &temp);
 149         if (ret < 0)
 150                 return ret;
 151
 152         ret = ds->drv->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
 153         if (ret < 0)
 154                 return ret;
 155
 156         return count;
 157 }
 158 static DEVICE_ATTR_RW(temp1_max);
 159
 160 static ssize_t temp1_max_alarm_show(struct device *dev,
 161                                     struct device_attribute *attr, char *buf)
 162 {
 163         struct dsa_switch *ds = dev_get_drvdata(dev);
 164         bool alarm;
 165         int ret;
 166
 167         ret = ds->drv->get_temp_alarm(ds, &alarm);
 168         if (ret < 0)
 169                 return ret;
 170
 171         return sprintf(buf, "%d\n", alarm);
 172 }
 173 static DEVICE_ATTR_RO(temp1_max_alarm);
 174
 175 static struct attribute *dsa_hwmon_attrs[] = {
 176         &dev_attr_temp1_input.attr,     /* 0 */
 177         &dev_attr_temp1_max.attr,       /* 1 */
 178         &dev_attr_temp1_max_alarm.attr, /* 2 */
 179         NULL
 180 };
 181
 182 static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
 183                                        struct attribute *attr, int index)
 184 {
 185         struct device *dev = container_of(kobj, struct device, kobj);
 186         struct dsa_switch *ds = dev_get_drvdata(dev);
 187         struct dsa_switch_driver *drv = ds->drv;
 188         umode_t mode = attr->mode;
 189
 190         if (index == 1) {
 191                 if (!drv->get_temp_limit)
 192                         mode = 0;
 193                 else if (!drv->set_temp_limit)
 194                         mode &= ~S_IWUSR;
 195         } else if (index == 2 && !drv->get_temp_alarm) {
 196                 mode = 0;
 197         }
 198         return mode;
 199 }
 200
 201 static const struct attribute_group dsa_hwmon_group = {
 202         .attrs = dsa_hwmon_attrs,
 203         .is_visible = dsa_hwmon_attrs_visible,
 204 };
 205 __ATTRIBUTE_GROUPS(dsa_hwmon);
 206
 207 #endif /* CONFIG_NET_DSA_HWMON */
 208
 209 /* basic switch operations **************************************************/
 210 int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct device *dev,
 211                       struct device_node *port_dn, int port)
 212 {
 213         struct phy_device *phydev;
 214         int ret, mode;
 215
 216         if (of_phy_is_fixed_link(port_dn)) {
 217                 ret = of_phy_register_fixed_link(port_dn);
 218                 if (ret) {
 219                         dev_err(dev, "failed to register fixed PHY\n");
 220                         return ret;
 221                 }
 222                 phydev = of_phy_find_device(port_dn);
 223
 224                 mode = of_get_phy_mode(port_dn);
 225                 if (mode < 0)
 226                         mode = PHY_INTERFACE_MODE_NA;
 227                 phydev->interface = mode;
 228
 229                 genphy_config_init(phydev);
 230                 genphy_read_status(phydev);
 231                 if (ds->drv->adjust_link)
 232                         ds->drv->adjust_link(ds, port, phydev);
 233         }
 234
 235         return 0;
 236 }
 237
 238 static int dsa_cpu_dsa_setups(struct dsa_switch *ds, struct device *dev)
 239 {
 240         struct device_node *port_dn;
 241         int ret, port;
 242
 243         for (port = 0; port < DSA_MAX_PORTS; port++) {
 244                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 245                         continue;
 246
 247                 port_dn = ds->ports[port].dn;
 248                 ret = dsa_cpu_dsa_setup(ds, dev, port_dn, port);
 249                 if (ret)
 250                         return ret;
 251         }
 252         return 0;
 253 }
 254
 255 const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
 256 {
 257         const struct dsa_device_ops *ops;
 258
 259         if (tag_protocol >= DSA_TAG_LAST)
 260                 return ERR_PTR(-EINVAL);
 261         ops = dsa_device_ops[tag_protocol];
 262
 263         if (!ops)
 264                 return ERR_PTR(-ENOPROTOOPT);
 265
 266         return ops;
 267 }
 268
 269 int dsa_cpu_port_ethtool_setup(struct dsa_switch *ds)
 270 {
 271         struct net_device *master;
 272         struct ethtool_ops *cpu_ops;
 273
 274         master = ds->dst->master_netdev;
 275         if (ds->master_netdev)
 276                 master = ds->master_netdev;
 277
 278         cpu_ops = devm_kzalloc(ds->dev, sizeof(*cpu_ops), GFP_KERNEL);
 279         if (!cpu_ops)
 280                 return -ENOMEM;
 281
 282         memcpy(&ds->dst->master_ethtool_ops, master->ethtool_ops,
 283                sizeof(struct ethtool_ops));
 284         ds->dst->master_orig_ethtool_ops = master->ethtool_ops;
 285         memcpy(cpu_ops, &ds->dst->master_ethtool_ops,
 286                sizeof(struct ethtool_ops));
 287         dsa_cpu_port_ethtool_init(cpu_ops);
 288         master->ethtool_ops = cpu_ops;
 289
 290         return 0;
 291 }
 292
 293 void dsa_cpu_port_ethtool_restore(struct dsa_switch *ds)
 294 {
 295         struct net_device *master;
 296
 297         master = ds->dst->master_netdev;
 298         if (ds->master_netdev)
 299                 master = ds->master_netdev;
 300
 301         master->ethtool_ops = ds->dst->master_orig_ethtool_ops;
 302 }
 303
 304 static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 305 {
 306         struct dsa_switch_driver *drv = ds->drv;
 307         struct dsa_switch_tree *dst = ds->dst;
 308         struct dsa_chip_data *cd = ds->cd;
 309         bool valid_name_found = false;
 310         int index = ds->index;
 311         int i, ret;
 312
 313         /*
 314          * Validate supplied switch configuration.
 315          */
 316         for (i = 0; i < DSA_MAX_PORTS; i++) {
 317                 char *name;
 318
 319                 name = cd->port_names[i];
 320                 if (name == NULL)
 321                         continue;
 322
 323                 if (!strcmp(name, "cpu")) {
 324                         if (dst->cpu_switch != -1) {
 325                                 netdev_err(dst->master_netdev,
 326                                            "multiple cpu ports?!\n");
 327                                 ret = -EINVAL;
 328                                 goto out;
 329                         }
 330                         dst->cpu_switch = index;
 331                         dst->cpu_port = i;
 332                         ds->cpu_port_mask |= 1 << i;
 333                 } else if (!strcmp(name, "dsa")) {
 334                         ds->dsa_port_mask |= 1 << i;
 335                 } else {
 336                         ds->enabled_port_mask |= 1 << i;
 337                 }
 338                 valid_name_found = true;
 339         }
 340
 341         if (!valid_name_found && i == DSA_MAX_PORTS) {
 342                 ret = -EINVAL;
 343                 goto out;
 344         }
 345
 346         /* Make the built-in MII bus mask match the number of ports,
 347          * switch drivers can override this later
 348          */
 349         ds->phys_mii_mask = ds->enabled_port_mask;
 350
 351         /*
 352          * If the CPU connects to this switch, set the switch tree
 353          * tagging protocol to the preferred tagging format of this
 354          * switch.
 355          */
 356         if (dst->cpu_switch == index) {
 357                 dst->tag_ops = dsa_resolve_tag_protocol(drv->tag_protocol);
 358                 if (IS_ERR(dst->tag_ops)) {
 359                         ret = PTR_ERR(dst->tag_ops);
 360                         goto out;
 361                 }
 362
 363                 dst->rcv = dst->tag_ops->rcv;
 364         }
 365
 366         memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));
 367
 368         /*
 369          * Do basic register setup.
 370          */
 371         ret = drv->setup(ds);
 372         if (ret < 0)
 373                 goto out;
 374
 375         ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
 376         if (ret < 0)
 377                 goto out;
 378
 379         if (!ds->slave_mii_bus && drv->phy_read) {
 380                 ds->slave_mii_bus = devm_mdiobus_alloc(parent);
 381                 if (!ds->slave_mii_bus) {
 382                         ret = -ENOMEM;
 383                         goto out;
 384                 }
 385                 dsa_slave_mii_bus_init(ds);
 386
 387                 ret = mdiobus_register(ds->slave_mii_bus);
 388                 if (ret < 0)
 389                         goto out;
 390         }
 391
 392         /*
 393          * Create network devices for physical switch ports.
 394          */
 395         for (i = 0; i < DSA_MAX_PORTS; i++) {
 396                 ds->ports[i].dn = cd->port_dn[i];
 397
 398                 if (!(ds->enabled_port_mask & (1 << i)))
 399                         continue;
 400
 401                 ret = dsa_slave_create(ds, parent, i, cd->port_names[i]);
 402                 if (ret < 0) {
 403                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
 404                                    index, i, cd->port_names[i], ret);
 405                         ret = 0;
 406                 }
 407         }
 408
 409         /* Perform configuration of the CPU and DSA ports */
 410         ret = dsa_cpu_dsa_setups(ds, parent);
 411         if (ret < 0) {
 412                 netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
 413                            index);
 414                 ret = 0;
 415         }
 416
 417         ret = dsa_cpu_port_ethtool_setup(ds);
 418         if (ret)
 419                 return ret;
 420
 421 #ifdef CONFIG_NET_DSA_HWMON
 422         /* If the switch provides a temperature sensor,
 423          * register with hardware monitoring subsystem.
 424          * Treat registration error as non-fatal and ignore it.
 425          */
 426         if (drv->get_temp) {
 427                 const char *netname = netdev_name(dst->master_netdev);
 428                 char hname[IFNAMSIZ + 1];
 429                 int i, j;
 430
 431                 /* Create valid hwmon 'name' attribute */
 432                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
 433                         if (isalnum(netname[i]))
 434                                 hname[j++] = netname[i];
 435                 }
 436                 hname[j] = '\0';
 437                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
 438                           hname, index);
 439                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
 440                                         ds->hwmon_name, ds, dsa_hwmon_groups);
 441                 if (IS_ERR(ds->hwmon_dev))
 442                         ds->hwmon_dev = NULL;
 443         }
 444 #endif /* CONFIG_NET_DSA_HWMON */
 445
 446         return ret;
 447
 448 out:
 449         return ret;
 450 }
 451
 452 static struct dsa_switch *
 453 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 454                  struct device *parent, struct device *host_dev)
 455 {
 456         struct dsa_chip_data *cd = dst->pd->chip + index;
 457         struct dsa_switch_driver *drv;
 458         struct dsa_switch *ds;
 459         int ret;
 460         const char *name;
 461         void *priv;
 462
 463         /*
 464          * Probe for switch model.
 465          */
 466         drv = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
 467         if (drv == NULL) {
 468                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
 469                            index);
 470                 return ERR_PTR(-EINVAL);
 471         }
 472         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
 473                     index, name);
 474
 475
 476         /*
 477          * Allocate and initialise switch state.
 478          */
 479         ds = devm_kzalloc(parent, sizeof(*ds), GFP_KERNEL);
 480         if (ds == NULL)
 481                 return ERR_PTR(-ENOMEM);
 482
 483         ds->dst = dst;
 484         ds->index = index;
 485         ds->cd = cd;
 486         ds->drv = drv;
 487         ds->priv = priv;
 488         ds->dev = parent;
 489
 490         ret = dsa_switch_setup_one(ds, parent);
 491         if (ret)
 492                 return ERR_PTR(ret);
 493
 494         return ds;
 495 }
 496
 497 void dsa_cpu_dsa_destroy(struct device_node *port_dn)
 498 {
 499         struct phy_device *phydev;
 500
 501         if (of_phy_is_fixed_link(port_dn)) {
 502                 phydev = of_phy_find_device(port_dn);
 503                 if (phydev) {
 504                         phy_device_free(phydev);
 505                         fixed_phy_unregister(phydev);
 506                 }
 507         }
 508 }
 509
 510 static void dsa_switch_destroy(struct dsa_switch *ds)
 511 {
 512         int port;
 513
 514 #ifdef CONFIG_NET_DSA_HWMON
 515         if (ds->hwmon_dev)
 516                 hwmon_device_unregister(ds->hwmon_dev);
 517 #endif
 518
 519         /* Destroy network devices for physical switch ports. */
 520         for (port = 0; port < DSA_MAX_PORTS; port++) {
 521                 if (!(ds->enabled_port_mask & (1 << port)))
 522                         continue;
 523
 524                 if (!ds->ports[port].netdev)
 525                         continue;
 526
 527                 dsa_slave_destroy(ds->ports[port].netdev);
 528         }
 529
 530         /* Disable configuration of the CPU and DSA ports */
 531         for (port = 0; port < DSA_MAX_PORTS; port++) {
 532                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 533                         continue;
 534                 dsa_cpu_dsa_destroy(ds->ports[port].dn);
 535
 536                 /* Clearing a bit which is not set does no harm */
 537                 ds->cpu_port_mask |= ~(1 << port);
 538                 ds->dsa_port_mask |= ~(1 << port);
 539         }
 540
 541         if (ds->slave_mii_bus && ds->drv->phy_read)
 542                 mdiobus_unregister(ds->slave_mii_bus);
 543 }
 544
 545 #ifdef CONFIG_PM_SLEEP
 546 static int dsa_switch_suspend(struct dsa_switch *ds)
 547 {
 548         int i, ret = 0;
 549
 550         /* Suspend slave network devices */
 551         for (i = 0; i < DSA_MAX_PORTS; i++) {
 552                 if (!dsa_is_port_initialized(ds, i))
 553                         continue;
 554
 555                 ret = dsa_slave_suspend(ds->ports[i].netdev);
 556                 if (ret)
 557                         return ret;
 558         }
 559
 560         if (ds->drv->suspend)
 561                 ret = ds->drv->suspend(ds);
 562
 563         return ret;
 564 }
 565
 566 static int dsa_switch_resume(struct dsa_switch *ds)
 567 {
 568         int i, ret = 0;
 569
 570         if (ds->drv->resume)
 571                 ret = ds->drv->resume(ds);
 572
 573         if (ret)
 574                 return ret;
 575
 576         /* Resume slave network devices */
 577         for (i = 0; i < DSA_MAX_PORTS; i++) {
 578                 if (!dsa_is_port_initialized(ds, i))
 579                         continue;
 580
 581                 ret = dsa_slave_resume(ds->ports[i].netdev);
 582                 if (ret)
 583                         return ret;
 584         }
 585
 586         return 0;
 587 }
 588 #endif
 589
 590 /* platform driver init and cleanup *****************************************/
 591 static int dev_is_class(struct device *dev, void *class)
 592 {
 593         if (dev->class != NULL && !strcmp(dev->class->name, class))
 594                 return 1;
 595
 596         return 0;
 597 }
 598
 599 static struct device *dev_find_class(struct device *parent, char *class)
 600 {
 601         if (dev_is_class(parent, class)) {
 602                 get_device(parent);
 603                 return parent;
 604         }
 605
 606         return device_find_child(parent, class, dev_is_class);
 607 }
 608
 609 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 610 {
 611         struct device *d;
 612
 613         d = dev_find_class(dev, "mdio_bus");
 614         if (d != NULL) {
 615                 struct mii_bus *bus;
 616
 617                 bus = to_mii_bus(d);
 618                 put_device(d);
 619
 620                 return bus;
 621         }
 622
 623         return NULL;
 624 }
 625 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 626
 627 static struct net_device *dev_to_net_device(struct device *dev)
 628 {
 629         struct device *d;
 630
 631         d = dev_find_class(dev, "net");
 632         if (d != NULL) {
 633                 struct net_device *nd;
 634
 635                 nd = to_net_dev(d);
 636                 dev_hold(nd);
 637                 put_device(d);
 638
 639                 return nd;
 640         }
 641
 642         return NULL;
 643 }
 644
 645 #ifdef CONFIG_OF
 646 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 647                                         struct dsa_chip_data *cd,
 648                                         int chip_index, int port_index,
 649                                         struct device_node *link)
 650 {
 651         const __be32 *reg;
 652         int link_sw_addr;
 653         struct device_node *parent_sw;
 654         int len;
 655
 656         parent_sw = of_get_parent(link);
 657         if (!parent_sw)
 658                 return -EINVAL;
 659
 660         reg = of_get_property(parent_sw, "reg", &len);
 661         if (!reg || (len != sizeof(*reg) * 2))
 662                 return -EINVAL;
 663
 664         /*
 665          * Get the destination switch number from the second field of its 'reg'
 666          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 667          */
 668         link_sw_addr = be32_to_cpup(reg + 1);
 669
 670         if (link_sw_addr >= pd->nr_chips)
 671                 return -EINVAL;
 672
 673         cd->rtable[link_sw_addr] = port_index;
 674
 675         return 0;
 676 }
 677
 678 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 679                               struct dsa_chip_data *cd,
 680                               int chip_index, int port_index,
 681                               struct device_node *port,
 682                               const char *port_name)
 683 {
 684         struct device_node *link;
 685         int link_index;
 686         int ret;
 687
 688         for (link_index = 0;; link_index++) {
 689                 link = of_parse_phandle(port, "link", link_index);
 690                 if (!link)
 691                         break;
 692
 693                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 694                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 695                                                          port_index, link);
 696                         if (ret)
 697                                 return ret;
 698                 }
 699         }
 700         return 0;
 701 }
 702
 703 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 704 {
 705         int i;
 706         int port_index;
 707
 708         for (i = 0; i < pd->nr_chips; i++) {
 709                 port_index = 0;
 710                 while (port_index < DSA_MAX_PORTS) {
 711                         kfree(pd->chip[i].port_names[port_index]);
 712                         port_index++;
 713                 }
 714
 715                 /* Drop our reference to the MDIO bus device */
 716                 if (pd->chip[i].host_dev)
 717                         put_device(pd->chip[i].host_dev);
 718         }
 719         kfree(pd->chip);
 720 }
 721
 722 static int dsa_of_probe(struct device *dev)
 723 {
 724         struct device_node *np = dev->of_node;
 725         struct device_node *child, *mdio, *ethernet, *port;
 726         struct mii_bus *mdio_bus, *mdio_bus_switch;
 727         struct net_device *ethernet_dev;
 728         struct dsa_platform_data *pd;
 729         struct dsa_chip_data *cd;
 730         const char *port_name;
 731         int chip_index, port_index;
 732         const unsigned int *sw_addr, *port_reg;
 733         u32 eeprom_len;
 734         int ret;
 735
 736         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 737         if (!mdio)
 738                 return -EINVAL;
 739
 740         mdio_bus = of_mdio_find_bus(mdio);
 741         if (!mdio_bus)
 742                 return -EPROBE_DEFER;
 743
 744         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 745         if (!ethernet) {
 746                 ret = -EINVAL;
 747                 goto out_put_mdio;
 748         }
 749
 750         ethernet_dev = of_find_net_device_by_node(ethernet);
 751         if (!ethernet_dev) {
 752                 ret = -EPROBE_DEFER;
 753                 goto out_put_mdio;
 754         }
 755
 756         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 757         if (!pd) {
 758                 ret = -ENOMEM;
 759                 goto out_put_ethernet;
 760         }
 761
 762         dev->platform_data = pd;
 763         pd->of_netdev = ethernet_dev;
 764         pd->nr_chips = of_get_available_child_count(np);
 765         if (pd->nr_chips > DSA_MAX_SWITCHES)
 766                 pd->nr_chips = DSA_MAX_SWITCHES;
 767
 768         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 769                            GFP_KERNEL);
 770         if (!pd->chip) {
 771                 ret = -ENOMEM;
 772                 goto out_free;
 773         }
 774
 775         chip_index = -1;
 776         for_each_available_child_of_node(np, child) {
 777                 chip_index++;
 778                 cd = &pd->chip[chip_index];
 779
 780                 cd->of_node = child;
 781
 782                 /* When assigning the host device, increment its refcount */
 783                 cd->host_dev = get_device(&mdio_bus->dev);
 784
 785                 sw_addr = of_get_property(child, "reg", NULL);
 786                 if (!sw_addr)
 787                         continue;
 788
 789                 cd->sw_addr = be32_to_cpup(sw_addr);
 790                 if (cd->sw_addr >= PHY_MAX_ADDR)
 791                         continue;
 792
 793                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 794                         cd->eeprom_len = eeprom_len;
 795
 796                 mdio = of_parse_phandle(child, "mii-bus", 0);
 797                 if (mdio) {
 798                         mdio_bus_switch = of_mdio_find_bus(mdio);
 799                         if (!mdio_bus_switch) {
 800                                 ret = -EPROBE_DEFER;
 801                                 goto out_free_chip;
 802                         }
 803
 804                         /* Drop the mdio_bus device ref, replacing the host
 805                          * device with the mdio_bus_switch device, keeping
 806                          * the refcount from of_mdio_find_bus() above.
 807                          */
 808                         put_device(cd->host_dev);
 809                         cd->host_dev = &mdio_bus_switch->dev;
 810                 }
 811
 812                 for_each_available_child_of_node(child, port) {
 813                         port_reg = of_get_property(port, "reg", NULL);
 814                         if (!port_reg)
 815                                 continue;
 816
 817                         port_index = be32_to_cpup(port_reg);
 818                         if (port_index >= DSA_MAX_PORTS)
 819                                 break;
 820
 821                         port_name = of_get_property(port, "label", NULL);
 822                         if (!port_name)
 823                                 continue;
 824
 825                         cd->port_dn[port_index] = port;
 826
 827                         cd->port_names[port_index] = kstrdup(port_name,
 828                                         GFP_KERNEL);
 829                         if (!cd->port_names[port_index]) {
 830                                 ret = -ENOMEM;
 831                                 goto out_free_chip;
 832                         }
 833
 834                         ret = dsa_of_probe_links(pd, cd, chip_index,
 835                                                  port_index, port, port_name);
 836                         if (ret)
 837                                 goto out_free_chip;
 838
 839                 }
 840         }
 841
 842         /* The individual chips hold their own refcount on the mdio bus,
 843          * so drop ours */
 844         put_device(&mdio_bus->dev);
 845
 846         return 0;
 847
 848 out_free_chip:
 849         dsa_of_free_platform_data(pd);
 850 out_free:
 851         kfree(pd);
 852         dev->platform_data = NULL;
 853 out_put_ethernet:
 854         put_device(&ethernet_dev->dev);
 855 out_put_mdio:
 856         put_device(&mdio_bus->dev);
 857         return ret;
 858 }
 859
 860 static void dsa_of_remove(struct device *dev)
 861 {
 862         struct dsa_platform_data *pd = dev->platform_data;
 863
 864         if (!dev->of_node)
 865                 return;
 866
 867         dsa_of_free_platform_data(pd);
 868         put_device(&pd->of_netdev->dev);
 869         kfree(pd);
 870 }
 871 #else
 872 static inline int dsa_of_probe(struct device *dev)
 873 {
 874         return 0;
 875 }
 876
 877 static inline void dsa_of_remove(struct device *dev)
 878 {
 879 }
 880 #endif
 881
 882 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 883                          struct device *parent, struct dsa_platform_data *pd)
 884 {
 885         int i;
 886         unsigned configured = 0;
 887
 888         dst->pd = pd;
 889         dst->master_netdev = dev;
 890         dst->cpu_switch = -1;
 891         dst->cpu_port = -1;
 892
 893         for (i = 0; i < pd->nr_chips; i++) {
 894                 struct dsa_switch *ds;
 895
 896                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
 897                 if (IS_ERR(ds)) {
 898                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 899                                    i, PTR_ERR(ds));
 900                         continue;
 901                 }
 902
 903                 dst->ds[i] = ds;
 904
 905                 ++configured;
 906         }
 907
 908         /*
 909          * If no switch was found, exit cleanly
 910          */
 911         if (!configured)
 912                 return -EPROBE_DEFER;
 913
 914         /*
 915          * If we use a tagging format that doesn't have an ethertype
 916          * field, make sure that all packets from this point on get
 917          * sent to the tag format's receive function.
 918          */
 919         wmb();
 920         dev->dsa_ptr = (void *)dst;
 921
 922         return 0;
 923 }
 924
 925 static int dsa_probe(struct platform_device *pdev)
 926 {
 927         struct dsa_platform_data *pd = pdev->dev.platform_data;
 928         struct net_device *dev;
 929         struct dsa_switch_tree *dst;
 930         int ret;
 931
 932         pr_notice_once("Distributed Switch Architecture driver version %s\n",
 933                        dsa_driver_version);
 934
 935         if (pdev->dev.of_node) {
 936                 ret = dsa_of_probe(&pdev->dev);
 937                 if (ret)
 938                         return ret;
 939
 940                 pd = pdev->dev.platform_data;
 941         }
 942
 943         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 944                 return -EINVAL;
 945
 946         if (pd->of_netdev) {
 947                 dev = pd->of_netdev;
 948                 dev_hold(dev);
 949         } else {
 950                 dev = dev_to_net_device(pd->netdev);
 951         }
 952         if (dev == NULL) {
 953                 ret = -EPROBE_DEFER;
 954                 goto out;
 955         }
 956
 957         if (dev->dsa_ptr != NULL) {
 958                 dev_put(dev);
 959                 ret = -EEXIST;
 960                 goto out;
 961         }
 962
 963         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 964         if (dst == NULL) {
 965                 dev_put(dev);
 966                 ret = -ENOMEM;
 967                 goto out;
 968         }
 969
 970         platform_set_drvdata(pdev, dst);
 971
 972         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
 973         if (ret) {
 974                 dev_put(dev);
 975                 goto out;
 976         }
 977
 978         return 0;
 979
 980 out:
 981         dsa_of_remove(&pdev->dev);
 982
 983         return ret;
 984 }
 985
 986 static void dsa_remove_dst(struct dsa_switch_tree *dst)
 987 {
 988         int i;
 989
 990         dst->master_netdev->dsa_ptr = NULL;
 991
 992         /* If we used a tagging format that doesn't have an ethertype
 993          * field, make sure that all packets from this point get sent
 994          * without the tag and go through the regular receive path.
 995          */
 996         wmb();
 997
 998         for (i = 0; i < dst->pd->nr_chips; i++) {
 999                 struct dsa_switch *ds = dst->ds[i];
1000
1001                 if (ds)
1002                         dsa_switch_destroy(ds);
1003         }
1004
1005         dsa_cpu_port_ethtool_restore(dst->ds[0]);
1006
1007         dev_put(dst->master_netdev);
1008 }
1009
1010 static int dsa_remove(struct platform_device *pdev)
1011 {
1012         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1013
1014         dsa_remove_dst(dst);
1015         dsa_of_remove(&pdev->dev);
1016
1017         return 0;
1018 }
1019
1020 static void dsa_shutdown(struct platform_device *pdev)
1021 {
1022 }
1023
1024 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
1025                           struct packet_type *pt, struct net_device *orig_dev)
1026 {
1027         struct dsa_switch_tree *dst = dev->dsa_ptr;
1028
1029         if (unlikely(dst == NULL)) {
1030                 kfree_skb(skb);
1031                 return 0;
1032         }
1033
1034         return dst->rcv(skb, dev, pt, orig_dev);
1035 }
1036
1037 static struct packet_type dsa_pack_type __read_mostly = {
1038         .type   = cpu_to_be16(ETH_P_XDSA),
1039         .func   = dsa_switch_rcv,
1040 };
1041
1042 static struct notifier_block dsa_netdevice_nb __read_mostly = {
1043         .notifier_call  = dsa_slave_netdevice_event,
1044 };
1045
1046 #ifdef CONFIG_PM_SLEEP
1047 static int dsa_suspend(struct device *d)
1048 {
1049         struct platform_device *pdev = to_platform_device(d);
1050         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1051         int i, ret = 0;
1052
1053         for (i = 0; i < dst->pd->nr_chips; i++) {
1054                 struct dsa_switch *ds = dst->ds[i];
1055
1056                 if (ds != NULL)
1057                         ret = dsa_switch_suspend(ds);
1058         }
1059
1060         return ret;
1061 }
1062
1063 static int dsa_resume(struct device *d)
1064 {
1065         struct platform_device *pdev = to_platform_device(d);
1066         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1067         int i, ret = 0;
1068
1069         for (i = 0; i < dst->pd->nr_chips; i++) {
1070                 struct dsa_switch *ds = dst->ds[i];
1071
1072                 if (ds != NULL)
1073                         ret = dsa_switch_resume(ds);
1074         }
1075
1076         return ret;
1077 }
1078 #endif
1079
1080 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
1081
1082 static const struct of_device_id dsa_of_match_table[] = {
1083         { .compatible = "brcm,bcm7445-switch-v4.0" },
1084         { .compatible = "marvell,dsa", },
1085         {}
1086 };
1087 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
1088
1089 static struct platform_driver dsa_driver = {
1090         .probe          = dsa_probe,
1091         .remove         = dsa_remove,
1092         .shutdown       = dsa_shutdown,
1093         .driver = {
1094                 .name   = "dsa",
1095                 .of_match_table = dsa_of_match_table,
1096                 .pm     = &dsa_pm_ops,
1097         },
1098 };
1099
1100 static int __init dsa_init_module(void)
1101 {
1102         int rc;
1103
1104         register_netdevice_notifier(&dsa_netdevice_nb);
1105
1106         rc = platform_driver_register(&dsa_driver);
1107         if (rc)
1108                 return rc;
1109
1110         dev_add_pack(&dsa_pack_type);
1111
1112         return 0;
1113 }
1114 module_init(dsa_init_module);
1115
1116 static void __exit dsa_cleanup_module(void)
1117 {
1118         unregister_netdevice_notifier(&dsa_netdevice_nb);
1119         dev_remove_pack(&dsa_pack_type);
1120         platform_driver_unregister(&dsa_driver);
1121 }
1122 module_exit(dsa_cleanup_module);
1123
1124 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1125 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
1126 MODULE_LICENSE("GPL");
1127 MODULE_ALIAS("platform:dsa");